Abstract Hypervelocity penetration experiments were performed on semi-infinite concrete targets with 7 mm-diameter 40CrNiMo steel long-rod projectiles at impact velocities ranging from 2117 m/s to 3086 m/s by using a two-stage combustion light-gas gun. After the experiments, the crater dimensions and penetration depth were carefully measured, also the residual projectiles were recovered. The depth of penetration was found to be greater than the hydrodynamic limit penetration depth. Numerical simulation was conducted to analyze the penetration process, and combined with the experimental results, it was obtained that the head of the long-rod projectile eroded and deformed into a hemisphere during hypervelocity penetration. According to the experimental and numerical simulation results, the penetration model of long-rod projectiles penetrating concrete targets at hypervelocity was constructed based on the Alekseevskii-Tate model. The penetration model was compared with the experimental depths of penetration, showing that the model had good applicability.

中文翻译：

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长杆钢弹超高速穿透混凝土目标：实验和理论分析

摘要 使用两级燃烧轻气枪，用直径7 mm的40CrNiMo钢长杆弹丸对半无限混凝土目标进行超高速穿透实验，冲击速度范围为2117 m/s～3086 m/s。实验结束后，仔细测量了弹坑尺寸和穿透深度，并回收了残留的弹丸。发现穿透深度大于流体动力学极限穿透深度。通过数值模拟分析了侵彻过程，并结合实验结果得出长杆弹头在超高速侵彻过程中受到侵蚀变形为半球状。根据实验和数值模拟结果，基于Alekseevskii-Tate模型构建了长杆弹体超高速穿透混凝土目标的穿透模型。将穿透模型与实验穿透深度进行对比，表明该模型具有良好的适用性。